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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Dale O'Brien | 2015-2024 | .153 | 0 | 28 | 108 | 64 | 0 | 2.71 | 1117 |
| Harry O'Connell | 2017-2030 | .260 | 299 | 912 | 0 | 0 | 0 | 0.00 | 0 |
| Larry O'Connell | 2042-2048 | .167 | 0 | 0 | 22 | 16 | 14 | 3.04 | 177 |
| Gary O'Gallivan | 2015-2015 | .191 | 6 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Malley | 2048-2048 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| David O'Neil | 2033-2035 | .000 | 0 | 0 | 0 | 1 | 0 | 5.52 | 13 |
| Dave O'Reilly | 2025-2026 | .203 | 6 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Arnold O'Sullivan | 2042-2045 | .053 | 0 | 0 | 9 | 16 | 3 | 5.22 | 119 |
| Josh O'Toole | 2030-2038 | .164 | 0 | 6 | 45 | 32 | 0 | 3.69 | 540 |
| Mike O'Toole | 2037-2042 | .062 | 0 | 1 | 5 | 1 | 0 | 4.05 | 159 |
| Jeff O'Vesy | 2015-2021 | .000 | 0 | 0 | 20 | 18 | 56 | 2.55 | 466 |
| Jesús Ocampo | 2033-2044 | .241 | 40 | 276 | 0 | 0 | 0 | 0.00 | 0 |
| Toshikuni Ogawa | 2044-2048 | .248 | 34 | 110 | 0 | 0 | 0 | 0.00 | 0 |
| Hirofumi Oike | 2026-2026 | .000 | 0 | 0 | 0 | 1 | 0 | 4.50 | 4 |
| Pablo Ojeda | 2040-2048 | .172 | 1 | 21 | 72 | 91 | 0 | 3.22 | 858 |
| Chris Oldford | 2017-2018 | .000 | 0 | 0 | 2 | 4 | 2 | 2.64 | 37 |
| Charles Olivares | 2020-2030 | .111 | 0 | 1 | 21 | 14 | 14 | 3.58 | 226 |
| Ron Oliver | 2022-2023 | .000 | 0 | 0 | 1 | 1 | 0 | 5.12 | 33 |
| Tom Oliver | 2047-2048 | .095 | 0 | 2 | 3 | 9 | 0 | 6.02 | 74 |
| Simon Olivier | 2046-2048 | .333 | 0 | 1 | 15 | 3 | 1 | 2.38 | 102 |
| Jim Olson | 2021-2022 | .189 | 7 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| César Olvera | 2034-2035 | .600 | 0 | 1 | 0 | 1 | 0 | 5.10 | 41 |
| Harvey Ormon | 2026-2044 | .289 | 459 | 1361 | 0 | 0 | 0 | 0.00 | 0 |
| Javier Orozco | 2025-2031 | .089 | 0 | 3 | 20 | 18 | 2 | 4.92 | 327 |
| Octávio Orozco | 2015-2023 | .280 | 13 | 222 | 0 | 0 | 0 | 40.50 | 1 |
| Eric Orr | 2031-2040 | .284 | 138 | 433 | 0 | 0 | 0 | 0.00 | 0 |
| Gary Orr | 2026-2026 | .000 | 0 | 0 | 1 | 3 | 0 | 9.90 | 2 |
| Nessun Orrell | 2017-2022 | .238 | 0 | 2 | 7 | 4 | 0 | 4.09 | 57 |
| Mike Orton | 2039-2042 | .109 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Agustín Ortíz | 2023-2030 | .220 | 11 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Leonard Ortíz | 2019-2025 | .132 | 1 | 7 | 39 | 44 | 0 | 3.37 | 593 |
| Lorenzo Ortíz | 2018-2018 | .165 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Manuel Ortíz | 2037-2040 | .125 | 0 | 0 | 3 | 3 | 0 | 3.58 | 62 |
| Martín Ortíz | 2016-2024 | .186 | 116 | 350 | 0 | 0 | 0 | 0.00 | 0 |
| Orlando Ortíz | 2037-2039 | .231 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ortíz | 2035-2040 | .266 | 33 | 150 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Ortíz | 2037-2046 | .248 | 38 | 207 | 0 | 0 | 0 | 0.00 | 0 |
| Artie Osborne | 2015-2018 | .220 | 25 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Silas Osborne | 2030-2042 | .167 | 0 | 26 | 70 | 92 | 1 | 3.94 | 986 |
| Jaime Osorio | 2039-2048 | .276 | 36 | 253 | 0 | 0 | 0 | 0.00 | 0 |
| Kelvin Ouwens | 2024-2031 | .193 | 1 | 10 | 38 | 45 | 2 | 4.45 | 416 |
| Mark Owen | 2020-2023 | .186 | 6 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Wen Owry | 2031-2032 | .100 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
